I'm rukasusan and this is my guide for Storm Spirit. That's is my way to play with him and I have a lot a success in my matches. My english is not the better, but i think you can understand what I put in this tutorial.
I hope you enjoy playing with Storm, he is my favorite hero!
The Build - Pros and cons
Storm is a very versatile hero but need a good mana pool. He does a good job as Initiator, Ganker, Disable and "Escape" has a great mobility in addition to being a good Pusher, can accumulate gold quickly using Static Remnant and Overload in several creep together.
Some weaknesses are: dependence on gold; vulnerable against Disable, you must manage your mana well, sometimes you can use your Ulti and, if you don't having enough mana to get where you want you can stay in a bad position, sometimes in danger to be killed.